Slow battleship hulls are usually better finished for gunfire support

Should an unfinished battleship hull without guns be converted into an aircraft carrier?

Only if it is fast enough; a conventional slow battleship is often better completed for gunfire and surface duties.

Roughly 28 knots provides a practical dividing line. A slower hull already carrying battleship armor may be quicker to finish for bombardment, fire support, and bad-weather surface defense than to rebuild into a compromised carrier. Second World War air power still had operational limits that preserved value in those surface roles.